No.01
PSK
Polysaccharide-K (Krestin)
Why this matters
- № 01Extensively researched for immune system support*
The Library · Vol. 01Entry No. 05· Chapter 01
Turkey Tail Mushroom
Trametes versicolor
One of the most researched medicinal mushrooms, named for its colorful, fan-shaped appearance. Extensively studied for its immune-supporting properties.
3
Active compounds
5
In our products
2
Clinical citations
01
Functional Mushrooms
Trametes versicolorBotanical illustration
§ 1The molecules
Active compounds.
No.02
PSP
Polysaccharopeptide
Why this matters
- № 01Supports healthy gut microbiome*
- № 02Supports immune cell activity*
No.03
Beta-Glucan
β-(1→3)(1→6)-glucan
Why this matters
- № 01Supports immune function by activating macrophages*
- № 02Activates natural killer cells*
*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
§ 2Receipts
What the research shows.
“Phase I clinical trial (n=11) evaluating Trametes versicolor (turkey tail) mushroom at escalating doses (3, 6, or 9 g/day) in women with breast cancer post-radiation. Turkey tail polysaccharopeptide (PSP) supplementation for 6 weeks significantly enhanced NK cell activity and increased CD8+ T-cell and CD19+ B-cell counts in a dose-dependent manner.”Torkelson et al., ISRN Oncology, 2012
“Systematic review of 13 RCTs evaluating polysaccharide-K (PSK) and polysaccharopeptide (PSP) from Trametes versicolor as adjuvant cancer therapy. PSK (3 g/day) alongside chemotherapy significantly improved 5-year survival rates in gastric and colorectal cancer patients, mediated through beta-glucan activation of innate and adaptive immunity.”Fritz et al., Integrative Cancer Therapies, 2015
From the Library · Vol. 01
Know exactly what
you're taking.
Every compound in your stack — sourced, dosed, and cited. No proprietary blends. Browse the science behind the bottles.
118Ingredients
180Compounds
14Chapters
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Ancient wisdom, beta-glucans, and the long-game terpenes.Showing 10 of 10 · View all
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Browse the full library§ 4Cross-references
Other ingredients that share compounds
CH.01
Lion's Mane Mushroom
Hericium erinaceus
A distinctive white, shaggy mushroom used for centuries in traditional Chinese medicine.
HericenonesErinacinesβ-(1→3)(1→6)-glucan
CH.01
Reishi Mushroom
Ganoderma lucidum
Known as the 'mushroom of immortality' in traditional Chinese medicine, Reishi has been used for over 2,000 years to support longevity and overall wellness.
Ganoderic acidsβ-(1→3)(1→6)-glucanPolysaccharides
CH.01
Cordyceps Mushroom
Cordyceps militaris
A unique fungus traditionally used by Tibetan herdsmen and Olympic athletes alike.
3'-deoxyadenosineAdenosineβ-(1→3)(1→6)-glucan
From the Journal
Keep reading.
Journal · turkey-tail
Mar 12, 2026
Turkey Tail and Your Gut: PSK, PSP, and the Immune-MicrobiomeA Connection
Turkey Tail has the most extensive human clinical data of any functional mushroom — but most of it came from oncology research. Here's what PSK does, and why the gut-immune connection is the angle that matters most for healthy people.
Read article→
Journal · chaga
Mar 12, 2026
Functional Mushrooms Decoded: Beta-Glucans, Polysaccharides, and What Actually Gets Absorbed
The functional mushroom category has a quality problem disguised as a variety problem. Understanding why requires going one level deeper — into the cell wall, the extraction process, and the molecular structures that actually do something.
Read article→
— End of entry
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